<?php
    $province = $REQUEST['province'];
    if ($province == "广东省") {
        echo "东莞市,深圳市,广州市,珠海市"
    }else if ($province == "江苏省") {
        echo "南京市,无锡市,苏州市,常州市"
    }else if ($province == "浙江省") {
        echo "杭州市,宁波市,温州市,嘉兴市"
    }else if ($province == "山东省") {
        echo "济南市,青岛市,烟台市,威海市"
    }

?>